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<title>Problem 1538. -- [POI2005]Dwa-Two parties
</title><center><h2>1538: [POI2005]Dwa-Two parties
</h2><span class=green>Time Limit: </span>5 Sec&nbsp;&nbsp;<span class=green>Memory Limit: </span>64 MB<br><span class=green>Submit: </span>10&nbsp;&nbsp;<span class=green>Solved: </span>0<br>[<a href='submitpage.php?id=1538'>Submit</a>][<a href='problemstatus.php?id=1538'>Status</a>][<a href='bbs.php?id=1538'>Discuss</a>]</center><h2>Description</h2><div class=content>国王 Byteasar 准备举行两个盛大的聚会并且邀请Byteotian 国民来参加. 当然每个人只能参加其中的一个聚会. 果然根据经验了解到当一个人在聚会时遇到了偶数个他认识的人他就会很高兴. 所以他要你来帮他把国民分配到两个聚会使得尽量多的人都可以变高兴.注意到认识是双向的,如果A 认识B, 那么B 肯定认识A. 
</div><h2>Input</h2><div class=content>第一行一个整数N ( 1 <= N <= 200) – 表示总人数. 接下来每行描述一个人的朋友. 第(i + 1)行的开始有一个整数li ( 0 <= li <= N - 1) – 表示第i个人认识的人的总数,接下来li 个数表示他认识的人的名单. 
</div><h2>Output</h2><div class=content>第一行一个数M – 表示参加第一个聚会的人数,第二行M 个整数表示参加人的名单. 如果有多解任意输出一个即可. 
Example 

In the above example everyone will have even number of friends at the party. 
</div><h2>Sample Input</h2>
			<div class=content><span class=sampledata></span></div><h2>Sample Output</h2>
			<div class=content><span class=sampledata></span></div><h2>HINT</h2>
			<div class=content><p>请不要提交此题.</p></div><h2>Source</h2>
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